SIM CARD N9 INTERPRETATION Support for SIM cards - any operator Built-in microphone up to 3 meters The built-in battery allows for 3 days in standby mode Up to 5 hours of active listening Call-Back function - calls back after picking up a call BUILT-IN BATTERY - WORK UP TO 3 DAYS Thanks to the built-in lithium-ion battery, the N9 wiretap can remain in standby mode on the battery for up to 3 days without connecting it to charging. ACTIVE LISTENING - TALK UP TO 5 HOURS Eavesdropping ensures work up to 5 hours in the listening mode. SIM CARD SUPPORT - ANY OPERATOR N9 supports SIM cards of any operator . Just put the sim card in wiretap without PIN code and voicemail. Call-Back function - Calls back after picking a sound The wiretap has a sound activation function , which means that as soon as it picks up the sound, it immediately makes a call to the phone number from which the call-back activation SMS was sent. Technical parameters: Connections: GPS/GPRS, Built-in battery: rechargeable, 500mAh GSM frequency: 850/900/1800/1900MHz, Charging: USB cable or 5V USB charger Compatibility: Windows 2000/XP/Vista/7/8/10, Mac OS Sound detection: YES, Weight and dimensions: 28g, 43mm x 32mm x 14mm Additional functions: Call-Back, eavesdropping function, Colour: BLACK Set: N9 listening device, USB cable, charger, manual in Polish